Characteristics and growth processes of sea ice in Lutzow-Holm Bay
Observations of multiyear land fast sea ice were made in Lutzow-Holm Bay, Antarctica over a period of two years from 1990 to 1991 to determine the snow and ice characteristics and ice growth prowth processes. The snow depth in the bay reached remarkably high values of 1.0 to 1.5m during the winter s...
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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:a9465a574c9d41519efb9e30dfbd7e63 2023-05-15T14:00:30+02:00 Characteristics and growth processes of sea ice in Lutzow-Holm Bay Toshiyuki Kawamura Takatoshi Takizawa Kay. I. Ohshima Shuki Ushio 1997-03-01T00:00:00Z https://doi.org/10.15094/00008983 https://doaj.org/article/a9465a574c9d41519efb9e30dfbd7e63 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00008983 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008983 0085-7289 2432-079X https://doaj.org/article/a9465a574c9d41519efb9e30dfbd7e63 Antarctic Record, Vol 41, Iss 1, Pp 367-383 (1997) Geography (General) G1-922 article 1997 ftdoajarticles https://doi.org/10.15094/00008983 2022-12-31T12:10:58Z Observations of multiyear land fast sea ice were made in Lutzow-Holm Bay, Antarctica over a period of two years from 1990 to 1991 to determine the snow and ice characteristics and ice growth prowth processes. The snow depth in the bay reached remarkably high values of 1.0 to 1.5m during the winter season at offshore stations. From analysis of ice thickness measurements, it is confirmed that fast ice with deep snow cover shows little growth during winter but substantially thickens during the summer months. On the basis of ice core structure, salinity and stable isotopic composition, it is concluded that the sea ice grows not downward as in ordinary growth but upward at the top of the sea ice. It is also concluded that the upward growth is caused by snow ice and superimposed ice formation. Superimposed ice formation on sea ice in Antarctica has not been reported previously. Evidence for snow cover melting, which is a prerequisite for superimposed ice formation, was also found. The summer upward growth was not found in sea ice with low snow accumulation. Snow cover, therefore, significantly affects the growth processes and structure of sea ice. General sea ice structure and characteristics of Antarctic sea ice are reviewed at the beginning of this report. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Toshiyuki Kawamura Takatoshi Takizawa Kay. I. Ohshima Shuki Ushio Characteristics and growth processes of sea ice in Lutzow-Holm Bay |
topic_facet |
Geography (General) G1-922 |
description |
Observations of multiyear land fast sea ice were made in Lutzow-Holm Bay, Antarctica over a period of two years from 1990 to 1991 to determine the snow and ice characteristics and ice growth prowth processes. The snow depth in the bay reached remarkably high values of 1.0 to 1.5m during the winter season at offshore stations. From analysis of ice thickness measurements, it is confirmed that fast ice with deep snow cover shows little growth during winter but substantially thickens during the summer months. On the basis of ice core structure, salinity and stable isotopic composition, it is concluded that the sea ice grows not downward as in ordinary growth but upward at the top of the sea ice. It is also concluded that the upward growth is caused by snow ice and superimposed ice formation. Superimposed ice formation on sea ice in Antarctica has not been reported previously. Evidence for snow cover melting, which is a prerequisite for superimposed ice formation, was also found. The summer upward growth was not found in sea ice with low snow accumulation. Snow cover, therefore, significantly affects the growth processes and structure of sea ice. General sea ice structure and characteristics of Antarctic sea ice are reviewed at the beginning of this report. |
format |
Article in Journal/Newspaper |
author |
Toshiyuki Kawamura Takatoshi Takizawa Kay. I. Ohshima Shuki Ushio |
author_facet |
Toshiyuki Kawamura Takatoshi Takizawa Kay. I. Ohshima Shuki Ushio |
author_sort |
Toshiyuki Kawamura |
title |
Characteristics and growth processes of sea ice in Lutzow-Holm Bay |
title_short |
Characteristics and growth processes of sea ice in Lutzow-Holm Bay |
title_full |
Characteristics and growth processes of sea ice in Lutzow-Holm Bay |
title_fullStr |
Characteristics and growth processes of sea ice in Lutzow-Holm Bay |
title_full_unstemmed |
Characteristics and growth processes of sea ice in Lutzow-Holm Bay |
title_sort |
characteristics and growth processes of sea ice in lutzow-holm bay |
publisher |
National Institute of Polar Research |
publishDate |
1997 |
url |
https://doi.org/10.15094/00008983 https://doaj.org/article/a9465a574c9d41519efb9e30dfbd7e63 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica ice core Sea ice |
genre_facet |
Antarc* Antarctic Antarctica ice core Sea ice |
op_source |
Antarctic Record, Vol 41, Iss 1, Pp 367-383 (1997) |
op_relation |
http://doi.org/10.15094/00008983 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008983 0085-7289 2432-079X https://doaj.org/article/a9465a574c9d41519efb9e30dfbd7e63 |
op_doi |
https://doi.org/10.15094/00008983 |
_version_ |
1766269665498103808 |